Bathtub



FIG. 1 is an upper front perspective view of a bathtub showing my new design;

FIG. 2 is an upper left perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The portions of the bathtub shown in broken lines form no part of the claimed design.

The dashed-dotted line showings of FIGS. 1, 2, and 7 illustrate boundaries between the claimed design and environmental features. 

CLAIM The ornamental design for a bathtub, as shown and described. 